Segregation: Segregation may be defined as the separation of the constituent materials of concrete from homogeneous mix.
Cause of segregation in concrete: Followings are the main cause of segregation
1) The root cause of segregation is difference in specific gravity and size of its constituent material.
2) Improper grading of aggregates.
3) Too much vibration during concreting.
4) Improper handling of aggregates.
5) High water cement ratio in concrete.Adding excess water while mixing concrete may lead to segregation.
6) Placing of concrete from a greater height, etc.
Prevention of Segregation:
1) Aggregate should be properly graded to prevent segregation.
2) Maintain proper water cement ratio.
3) At the time of placement care should be taken that the concrete is not poured from a height greater than 1.5 meter.
4) Care should be taken during compaction ( specially for compaction using mechanical vibrator).
5) To improve viscosity of concrete which prevent segregation, air entraining agents may use.
No comments:
Post a Comment